A battery module with built-in aerogel composite separator structure

Abstract

This invention discloses a battery module built-in aerogel composite separator structure, belonging to the field of battery separator technology. It includes a separator body composed of an outer separator frame and an inner densely distributed composite gel. The composite gel consists of an isolation skeleton, transfer-bearing airbags, and a flexible aerogel filler. The separator frame includes an outer composite frame and polyester fiber protective layers on both sides of the composite frame for wrapping the composite gel. Pressure buffers are provided inside the composite frame to elastically limit the movement of the composite gel. This invention designs an aerogel composite separator where, when the battery module compresses the separator, the inner transfer-bearing airbags discharge gas through micro-channels to the outermost inner buffer strip, causing it to expand outwards. This process directly acts on the pressure of the aerogel, converting it into controllable displacement, creating valuable deformation space for the internal aerogel, preventing it from being directly crushed, and achieving dynamic pressure redistribution.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery separators, in particular to a built-in aerogel composite separator structure of a battery module. BACKGROUND

[0002] With the continuous development of technology, there are more and more separator materials used between the internal batteries of a battery module, among which aerogel is used as a preferred material because it is much lighter than a conventional heat insulation material and can extremely effectively block heat transmission to adjacent battery modules, thereby saving valuable 'escape time' for the entire battery system and preventing a chain reaction of thermal runaway.

[0003] At present, the aerogel used between battery modules is mainly flexible aerogel and a composite material thereof. The unique nano-porous network structure of the aerogel makes it extremely fragile, and it is easy to be damaged in the case of extrusion, thereby causing the aerogel to be unable to recover and the heat insulation performance to be reduced. Although the existing composite material can provide a part of compression resistance by using fibers, the compression resistance provided by the composite material alone is often insufficient because the extrusion state between the batteries exists at all times in the daily operation of the vehicle-mounted battery. In addition, when the battery burns and explodes, the existing aerogel composite material is difficult to buffer the impact capacity, causing the aerogel material to be damaged and exposed, thereby affecting the heat insulation effect between the batteries. Based on this, the built-in aerogel composite separator structure of the battery module is proposed. SUMMARY

[0004] The application aims to solve the problems of the aerogel in the prior art and provides a built-in aerogel composite separator structure of a battery module.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] The built-in aerogel composite separator structure of the battery module comprises a separator plate body composed of an external separator frame and internally densely distributed composite gel bodies, and the composite gel body is composed of an isolation skeleton, a transfer bearing air bag and a flexible aerogel filling body.

[0007] The separator frame comprises a composite frame body at the periphery and a polyester fiber protective layer arranged on both sides of the composite frame body for wrapping the composite gel body, and the composite frame body is internally provided with a pressure buffer for elastically limiting the four sides of the composite gel body.

[0008] The isolation skeleton is composed of a skeleton cylinder and an outwardly expanded cylinder arranged on both sides of the skeleton cylinder.

[0009] The transfer bearing air bag is provided with a plurality of air bags arranged uniformly between adjacent isolation skeletons for buffering the vibration impact between the battery modules.

[0010] The flexible aerogel filling body is uniformly distributed around according to the isolation framework and the transfer load air bag shape.

[0011] As a preferred solution, the composite frame is composed of an inner hard strip and an outer flexible frame strip, which will deform when pressed.

[0012] As a preferred solution, the pressure buffer includes an inner buffer strip arranged in the composite frame, and an adaptive groove is arranged on the inner side of the inner buffer strip to match the shape of the transfer load air bag.

[0013] As a preferred solution, two sliding openings are arranged on the inner hard strip, a limiting connection slide strip is arranged in the sliding opening, adjacent limiting connection slide strips are connected to each other by an elastic pull rope, the limiting connection slide strip is connected to a buffer inclined strip, and a buffer inclined groove is arranged on the back of the inner buffer strip to match the buffer inclined strip.

[0014] As a preferred solution, the polyester fiber protective layer on both sides is connected to each other by a plurality of traction fibers arranged in the isolation framework, and the traction fibers are connected to the outer expansion cylinder by branch fibers.

[0015] As a preferred solution, the transfer load air bag is connected to each other by a micro pipeline arranged between the flexible aerogel filling bodies, so as to realize the delivery of the gas in the transfer load air bag.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1. The aerogel composite layer is designed, when the battery module extrudes the isolation layer, the transfer load air bag inside will discharge the gas to the outermost inner buffer strip through the micro pipeline, so as to expand outwardly, this process will directly act on the pressure of the aerogel, and is converted into a controllable displacement, so as to create a valuable deformation space for the aerogel inside, avoid being directly crushed, and realize dynamic pressure redistribution.

[0018] 2. The flexible frame strip is used as the first buffer to share the initial pressure, and realizes the outer buffer.

[0019] The internal pressure is converted into smooth displacement outwardly and to both sides by the inner buffer strip, the buffer inclined strip and the buffer inclined groove, so as to further absorb energy, and realize the middle buffer.

[0020] The isolation framework provides stable support and elastic recovery force, prevents the aerogel from being deformed too much, realizes internal support, and significantly improves the insufficient compression resistance of the aerogel. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1A structural assembly schematic diagram of a battery module built-in aerogel composite separator structure is provided in the present application.

[0022] Figure 2 A main structure schematic diagram of a battery module built-in aerogel composite separator structure is provided in the present application.

[0023] Figure 3 A structure schematic diagram of a separator frame in a battery module built-in aerogel composite separator structure is provided in the present application.

[0024] Figure 4 A structure schematic diagram of a composite gel body in a battery module built-in aerogel composite separator structure is provided in the present application.

[0025] Figure 5 A position relationship schematic diagram of an isolation skeleton and a transfer bearing air bag in a battery module built-in aerogel composite separator structure is provided in the present application.

[0026] Figure 6 An installation position structure schematic diagram of a buffer inclined surface strip in a battery module built-in aerogel composite separator structure is provided in the present application.

[0027] Figure 7 A structure schematic diagram of a pressure buffer in a battery module built-in aerogel composite separator structure is provided in the present application.

[0028] In the figure: 1, isolation skeleton; 101, skeleton cylinder; 102, outer expansion cylinder; 2, transfer bearing air bag; 3, flexible aerogel filling body; 4, composite frame body; 401, built-in hard strip; 402, flexible frame strip; 5, polyester fiber protective layer; 6, inner buffer strip; 7, limiting connection slide bar; 8, elastic pull rope; 9, buffer inclined surface strip; 10, buffer inclined groove; 11, traction fiber. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] Embodiment, refer to Figures 1 to 7 A battery module built-in aerogel composite separator structure, comprising a separator separator body, the separator separator body is composed of an outer separator frame and an inner dense distribution of composite gel body, the composite gel body is composed of a separation skeleton 1, a transfer bearing air bag 2 and a flexible aerogel filling body 3;

[0032] The transfer bearing air bag 2 is connected by the micro pipeline distributed between the flexible aerogel filling body 3, which can be connected to each other by one row and one row, realizing the transfer of the gas in the transfer bearing air bag 2;

[0033] It should be noted that the transfer bearing air bag 2 at the outermost side in the whole composite gel body is wrapped by the adaptive groove in the inner buffer strip 6, when the pressure between the adjacent battery modules, the internal transfer bearing air bag 2 will be under the action of pressure to the internal gas through the micro pipeline to the transfer bearing air bag 2 at the outermost side, through the expansion of the inner buffer strip 6, to buffer the impact force, and the gas of the transfer bearing air bag 2 disappears, which reduces the occupied area, which makes the flexible aerogel filling body 3 under pressure has more deformation space, thereby avoiding the structure failure of the flexible aerogel filling body 3 under strong pressure.

[0034] The separator frame comprises a composite frame 4 at the periphery and a polyester fiber protective layer 5 arranged on both sides of the composite frame 4 for wrapping the composite gel body, further, the composite frame 4 is composed of an inner built-in hard strip 401 and an outer flexible frame strip 402, the flexible frame strip 402 will deform when pressed.

[0035] Among them, the flexible frame strip 402 is equivalent to the buffer rubber arranged between the battery modules in the form of frame, which can share part of the pressure of the internal flexible aerogel filling body 3 when the battery modules are extruded, so as to avoid the structure failure of the flexible aerogel filling body 3.

[0036] The composite frame 4 is internally provided with a pressure buffer member for elastically limiting the four sides of the composite gel body. The pressure buffer member comprises an inner buffer strip 6 arranged in the composite frame 4. The inner side of the inner buffer strip 6 is provided with an adaptive groove matching the shape of the transfer bearing air bag 2. When the composite gel body is not under pressure, there is a space between the inner buffer strip 6 and the composite frame 4. The existence of the space can satisfy the outward expansion of the inner buffer strip 6 under the action of impact pressure.

[0037] Further, the inner hard strip 401 is provided with two sliding openings. A limiting connection slide strip 7 is slidably arranged in the sliding openings. Adjacent limiting connection slide strips 7 are connected to each other by an elastic pull rope 8. The elastic pull rope 8 always has a pulling force on the two buffer inclined surface strips 9. The limiting connection slide strip 7 is connected with the buffer inclined surface strip 9. The back of the inner buffer strip 6 is provided with a buffer inclined groove 10 matching the buffer inclined surface strip 9.

[0038] The advantage of the above structure is that when the composite gel body is under pressure, the inner buffer strip 6 will be extruded outward. When it is extruded, the buffer inclined groove 10 will generate pressure downward on the buffer inclined surface strip 9, so that the buffer inclined surface strip 9 moves to both sides, so that the inner buffer strip 6 can move outward to increase the deformation space of the internal composite gel body. This process will directly act on the pressure of the aerogel and convert it into a controllable displacement (there is such a displacement space between the battery pack and the battery box).

[0039] The isolation framework 1 is composed of a framework cylinder 101 and an outward cylinder 102 arranged on both sides of the framework cylinder 101. The transfer bearing air bag 2 is provided with multiple air bags, which are evenly arranged between adjacent isolation frameworks 1, and used for buffering the vibration impact between the battery modules. The flexible aerogel filling body 3 is evenly distributed around according to the shape of the isolation framework 1 and the transfer bearing air bag 2.

[0040] It should be noted that the flexible aerogel filling body 3 is arranged inside and outside the isolation framework 1. The isolation framework 1 is made of flexible high-temperature-resistant material. The surfaces on both sides do not occupy a large surface space, so as to ensure that the flexible aerogel filling body 3 can repeatedly contact the surface of the battery and achieve the maximum heat insulation effect. The existence of the isolation framework 1 also provides support and restraint force for the flexible aerogel filling body 3. In addition, the unique outward cylinder 102 on both sides of the framework cylinder 101 of the isolation framework 1 can provide the maximum compression bearing area and strong elastic recovery force.

[0041] Further, the polyester fiber protective layer 5 on both sides is connected to each other by a plurality of traction fibers 11 penetratingly arranged in the isolation framework 1. The traction fibers 11 are connected to the outward cylinder 102 through branch fibers. The arrangement of the traction fibers 11 can not only ensure the connection between the adjacent two polyester fiber protective layers 5 and the composite gel body, but also can realize the restraint of the aerogel around the isolation framework 1.

[0042] Traction fibers 11 run through the entire structure, connecting the polyester fiber protective layers 5 on both sides to the internal isolation framework 1 and flexible aerogel filling body 3, forming a whole, which not only prevents the disintegration of each component under vibration and impact, but also strengthens the binding of the aerogel, reducing its own wear and tear and dust generation.

[0043] Through the above mechanism, whether it is the long-term slow expansion of the battery during its life cycle (static extrusion) or the instantaneous impact when thermal runaway explosion occurs (dynamic impact), the destructive energy can be effectively absorbed and transferred; This ensures that the internal flexible aerogel filling body 3 is always in a safe low-stress environment, its nano-porous structure is preserved, thus maintaining its top-notch thermal insulation performance.

[0044] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A battery module built-in aerogel composite separator structure comprising a separator separator body, characterized in that, The interlayer partition body is composed of an external interlayer frame and an internal dense composite gel body, which is composed of an isolation skeleton (1), a transfer bearing air bag (2) and a flexible aerogel filling body (3); The interlayer frame includes a peripheral composite frame body (4) and a polyester fiber protective layer (5) arranged on both sides of the composite frame body (4) for wrapping the composite gel body, and the composite frame body (4) is internally provided with a pressure buffer for elastically limiting the periphery of the composite gel body; The isolation skeleton (1) is composed of a skeleton cylinder (101) and an outwardly expanded cylinder (102) arranged on both sides of the skeleton cylinder (101); The transfer bearing air bag (2) is provided with a plurality of air bags, which are uniformly arranged between adjacent isolation skeletons (1) and used for buffering the vibration impact between the battery modules; The flexible aerogel filling body (3) is uniformly distributed around according to the shape of the isolation skeleton (1) and the transfer bearing air bag (2); The composite frame body (4) is composed of an internal built-in hard strip (401) and an external flexible frame strip (402), and the flexible frame strip (402) will deform when subjected to pressure; The pressure buffer includes an internal buffer strip (6) arranged in the composite frame body (4), and an adaptive groove is formed in the inner side of the internal buffer strip (6) and matched with the shape of the transfer bearing air bag (2); Two sliding openings are formed in the built-in hard strip (401), and a limiting connection sliding strip (7) is slidably arranged in the sliding opening, adjacent limiting connection sliding strips (7) are connected with each other through an elastic pull rope (8), the limiting connection sliding strip (7) is connected with a buffer inclined strip (9), and a buffer inclined groove (10) is formed in the back of the internal buffer strip (6) and matched with the buffer inclined strip (9).

2. The battery module built-in aerogel composite separator structure according to claim 1, wherein, The polyester fiber protective layers (5) on both sides are connected with each other through a plurality of traction fibers (11) penetratingly arranged in the isolation skeleton (1), and the traction fibers (11) are connected with the outwardly expanded cylinder (102) through branch fibers.

3. The battery module built-in aerogel composite separator structure according to claim 1, wherein, The transfer bearing air bags (2) are connected with each other through micro-pipelines distributed between the flexible aerogel filling bodies (3), so as to realize the conveying of the gas in the transfer bearing air bags (2).

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